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P0171 Diagnostic Trouble Code Discussion for May 2009

Fuel System Lean (Bank 1) *

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Trouble Ticket Help Requests for DTC P0171

	Help Request	Posted
	2001 BMW 330i 3.0L MIL Lamp on VIN: WBAAV53401 P0171: lean bank 2. fuel trim limit, bank 1, bank 2. smoke test for intake leak. none found. mass airflow sensor out of range. replace and reset adaptations, test drove. after sitting over night, ran rough at start up, would not accelerate. recoded. clear and reset adaptaions. te...	May 01, 2009
	2001 Ford Windstar LX 3.8L MIL Lamp on VIN: 2FMZA50411 P0171: bank 1 lean. hello. guys ive had this truck for over a week now and ive been trying to fix it but it just wont work. the long term fuel trim in bank 1 and 2 is marking 25 percent and the short fuel trim is marking normal 0 and negative 3 and i have erased the memory kam by...	May 05, 2009
	2005 Mercedes-Benz C230 Kompressor 1.8L Misfire, MIL Lamp on VIN: WDBRF40JX5 P0171: bank 1 too lean. ... as to what the car is doing. started vehcile misfire and codes p0101 bank 1 too lean and p0172 bank 1 too rich. checked for vacume leak, no leaks found. not sure where to go from here.	May 06, 2009
	2006 Hummer H3 3.5L MIL Lamp on VIN: 5GTDN13696 P0171: Fuel Trim System Lean. ... have a recurrent MIL lamp ON (P0171). I think I have a concept missed or I lack of complete understanding about how emission control works in this veh. Let me give you all the data: All info at close loop - Upstream HO2S is oscilating well between 0.2 and ...	May 07, 2009
	2002 Jaguar X-Type 2.5L Surge, MIL on- no P codes VIN: SAJEA51D22 P0171: Bank 1 Lean back in January not present now. Hello out there in Jag headache land! I will thank all who will offer help, as I haven't much experience with Jaguar. I hope that some Jaguar experts can help me with this 2002 X-Type. It appears that this vehicle may never pass the Illinois EPA OBD2 emissi...	May 07, 2009
	2002 Jaguar X-Type 2.5L Surge, MIL on- no P codes VIN: SAJEA51D22 P0171: Bank 1 Lean back in January not present now. Hello out there in Jag headache land! I will thank all who will offer help, as I haven't much experience with Jaguar. I hope that some Jaguar experts can help me with this 2002 X-Type. It appears that this vehicle may never pass the Illinois EPA OBD2 emissi...	May 09, 2009
	1998 Chevrolet C1500 Cheyenne 5.7L MIL Lamp on VIN: 2GCEC19R3W P0171: Fuel Trim System Lean (Bank 1). This truck sets both lean codes fairly rapidly after clearing. Problem started a few months ago but customer wouldn't leave truck for repairs so I tried some swaptronics with the MAF sensor from my truck. He still had a problem and I did not, so we decided to ...	May 12, 2009
	2001 Ford E-350 Econoline 5.4L Poor Idle Quality, Hesitation, Cuts out, MIL Lamp on VIN: 1FDWE35L11 P0171: bank 1 lean. ... code p0171. Also rought idle and has no power. Checked fuel pressure found @ 30psi, cleaned MAF, o2 switching ok, removed o2 on bank 1 to see if cat was clogged, no difference. Checked for vacuum leaks w\motovac no leakes found. Noticed ALOT of vacuum @ ia...	May 12, 2009
	2004 Honda Accord EX 2.4L MIL Lamp on VIN: 1HGCM56674 P0171: Fuel System Too Lean (Bank 1). car came in with engine light on p0171 and i have been through this thing with a fine tooth comb, i have talked to ac delco tech, an acura tech and a honda tech. when the car came in it was adding 30% fuel short term, long term was adding 7%, after everything ...	May 12, 2009
	2002 Saturn SL1 1.9L Poor Idle Quality, Hesitation, Surge, MIL Lamp on VIN: 1G8ZH52832 P0171: Fuel Trim System Lean (Bank 1). Installed new pump due to erratic operation Loss of fuel pressure with exceesive pump noise during pressure loss, and poor electrical pattern. Replaced fuel filter at same time. Both Carquest parts. (CQ/WIX filter & CQ/AIRTEX pump. Don't ususally use CQ pu...	May 12, 2009
	2003 Jeep Grand Cherokee Limited 4.7L Excessive Emissions, No Start, Poor Idle Quality, Stall, Misfire, MIL Lamp on VIN: 1J4GW58N63 P0171: Fuel System Lean (Bank 1). jeep came in on hook, customer stated died while driving,tach & all gauges went crazy, no restart. got in shop battery dead, installed new battery, jeep was flooded, cler flood & restarted. drove aprox 2 miles & died. got back into shop clear flood...	May 14, 2009
	2006 GMC Savana 1500 5.3L MIL Lamp on VIN: 1GKFH15T66 P0171: Fuel Trim System Lean (Bank 1). hello and thanks for the help. this vehicle came in with a lean condition on bank 1 and 2. after checking freeze fram record the fault happened at idle we found the fuel trim long term was maxed out. we then searched for vac leaks and found it leaking at the i...	May 15, 2009
	1998 Ford Contour 2.5L MIL Lamp on P0171: lean con. b1. hello everyone...really need help with this one. after repairing leaky intake gasteks...and pcv valve system clearing the codes and resetting the kam .drove the car a couple of times reset the codes po171/po174. don't have fuel pressure numbers but is in spe...	May 20, 2009
	2002 Ford Ranger Edge 3.0L Poor Idle Quality, Hesitation, Misfire, Poor Fuel Economy, MIL Lamp on, NO POWER. VIN: 1FTYR44V52 P0171: bank1 lean lftrim is. about 10% of improvement was noticed after repair. the main concern is no power on acceleration. crank and cam signals are ok, no glitches on scope when driving. cam sensor synchronizer is in correct position. no exhaust backprssure exists, removed twc and pro...	May 26, 2009
	1999 Ford Econoline Super Duty Custom 6.8L MIL Lamp on P0171: Fuel system lean Bnk one. B1S1 goes lean and both fuel trims max out if you shift from park to reverse. If you go to neutral, O2 starts banging away good. If you power brake in reverse then go to neutral O2 stays dead. If you go to drive, it comes back to life. Sure sounds like a bad c...	May 27, 2009
	2006 Ford E-250 4.6L Poor Idle Quality, Stall, MIL Lamp on VIN: 1FTNE24WX6 P0171: lean b1. ... find a map sensor or a barometric sensor, i learned about the esm. i followed the tests in alldata and they indicated faulty esm. replaced, and still have problem. p0106, p0171, and p01...	May 27, 2009
	2004 GMC Yukon SLE 5.3L MIL Lamp on VIN: 1GKEK13TX4 P0171: Fuel Trim System Lean (Bank 1). ... the other day with a check engine light. Codes P0171 and P0174 were found. First, I checked all the basics. Fuel pressure, volume, engine vacuum, intake duct leaks, smoke tested the intake ducts, PCV blocked off, fuel ...	May 27, 2009
	2000 Toyota Corolla VE 1.8L MIL Lamp on VIN: 2T1BR18E9Y P0171: Fuel System Too Lean (Bank 1). Hello members. Thanks in advance for any help. My customer had gone to the dealer for the MIL coming on last year. Not sure how long it was before it came back on but was told it was quite a while. Dealer invoice shows Air flow sensor was cleaned to repair pro...	May 28, 2009
	2006 Chevrolet Trailblazer LT 4.2L Poor Idle Quality, Cuts out, MIL Lamp on, no throttle control VIN: 1GNET16S76 P0171: Fuel System Lean (Bank 1). This truck came in No Start no crank, with no fuel pressure Had good power and ground at fuel pump so I replaced the pump, now has fuel. Also had a blown main fuse 180 amp when it came in. After repairs it started and ran but after about 2 min's it started idl...	May 29, 2009
	2000 Ford Focus LX 2.0L Poor Idle Quality, Hesitation VIN: 1FAFP33P8Y P0171: system too lean bank 1. vehicle came in with customer complaint of lack of power intermittently. cutomer had plugs, plug wires and ignition coil replaced. we verified complaint and vehicle act's like retarded ignition or cam timing. checked fuel psi- ok, checked for restricted exhaus...	May 29, 2009
	2006 Ford E-250 4.6L Poor Idle Quality, Stall, MIL Lamp on VIN: 1FTNE24WX6 P0171: lean b1. ... find a map sensor or a barometric sensor, i learned about the esm. i followed the tests in alldata and they indicated faulty esm. replaced, and still have problem. p0106, p0171, and p01...	May 30, 2009